High pH causes organic tissue to disintegrate out of the dentinal tubule
Nevertheless, sometimes a correctly performed endodontic treatment can fail due to apical radicular dentinal tubule
microorganism invasion capable of adhering and surviving in the root canal by biofilm formation [1,3,6-8].
3 Gpa, obtained by simulating an isotropic model on dry dentin, by measuring in a direction perpendicular to the dentinal tubule
, while in wet dentin they reported a value of 24.
10,38) The smear layer plugs the dentinal tubule
orifices with debris that consists of dentinal shavings, tissue debris, odontoblastic processes, and microbial elements.
Smear layer was completely removed and the marginal outline of the dentinal tubule
orifice is clear (Figure 2).
Some methodologies allow direct contact of the irrigant with the microorganism (as in the agar diffusion test) while others, such as in our study, may not necessarily allow a direct contact of the irrigant with the microorganism entombed inside the dentinal tubule
Removal of this layer is essential since it acts as a nidus for microbes and tends to alter dentinal tubule
surface, which in turn jeopardizes the innate adaptation of obturation materials to dentine.
Fluoride action involves dentinal tubule
obliteration and modification of enamel permeability.
Although the morphological characteristics of the dentinal tubule
have been described through numerous studies, the precise mechanism of pain transmission from the exposed dentin surface to the terminal nerve ending is only theorized.
occlusion in humans, at present, can only be evaluated by extraction, replication or dentin biopsy, all of which have their own problems and limitations.
Alterations such as dentinal tubule
opening, removal of dentinal plugs and the organic portion of intertubular dentin, that increase the tubules' diameter and cause collagen exposure, have also been reported.
Cleaning of both the root canal and the dentinal tubule
system, as well as proper filling of the canal, are essential procedures for the success of root canal treatment.